Malicious PDF — malware analysis report

Static analysis result for SHA-256 f175b37a7c245bdc…

MALICIOUS

PDF

73.7 KB Created: 2021-03-31 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec91012e6bc0e64b63855def90980f7f SHA-1: c09110ca74c2f966a1ca52f8ddf99d8d632d862c SHA-256: f175b37a7c245bdc0558c449d501bcc23b7de4175b2393823bb4ee50e67a0154
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by both ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=ambum+stone+theme', are likely part of this scheme to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=ambum+stone+theme PDF link annotation
    • http://vukufitu.mywebcommunity.org/geomorphology_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/Ngjibja/80979033170.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/gdhjaig/usa_online_shopping_sites_for_electronics.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/dtpQjgR/16768865747.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/Aqhaxic/like_father_like_son_chinese_proverb.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/idwehbq/big_head_basketball_unblocked_games_arcade.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/bible_study_book_of_ephesians.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aa6622c6-54ed-40ea-b328-ded306848426/90451346876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a2eac7-93e2-4bed-91b5-b2eb33ddb4dd/jesiwasinu.pdfIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_0ef1954d9f0548c598f753acb0e20caf.pdf?index=trueIn PDF document text
    • http://likewiwojuxus.atwebpages.com/how_to_clean_aloha_breeze_32_tower_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e5e427-fa51-4180-a4b7-43d07b8b9105/gidisemilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3010ba93-2bbc-4958-9a81-bcc0785323a9/jajaratarogobumanefala.pdfIn PDF document text
    • http://vimedunofonuw.rf.gd/efectos_secundarios_dela_metformina_clorhidrato_850_mg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14298c5d-8d16-4ebc-9b96-946fe4f1c383/lexus_rx_350_price_in_nigeria_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcf895e-e610-43fd-b33c-9cb0b158dd77/vimaseligopugakiverede.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_45e7910823bf40aeb437f408bb36d486.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_396cc9a71fd44e43ad34a8b3316998ab.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/antifouling_convention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c55679-769e-457e-b676-c0bb85b0b86c/58931685038.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_5855ef005cf84105babc12857bbb6988.pdf?index=trueIn PDF document text
    • http://tobobuximalusu.epizy.com/antelope_audio_orion_studio_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 4552 bytes
SHA-256: 692af3157393c8b92a1de02f3270d0776d10dedbc9c0fa6bf56fcb296420459d
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 9948 bytes
SHA-256: 4c5d7266cfb74445b4b6a0bc19ff0a00484143e22e5a91343ddfe00dda39acc0
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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